Today the use of network technologies has become a part of our life. Most of the networks, either Internet or intranet, wired or wireless, is full infrastructure based, which, however, has limitations to form the more and more pursued ad hoc net work in the market. As a response, Bluetooth technology is proposed to realize ad hoc wireless personal networks or other short range networks using affordable chips with low power demand. The entire set of specifications of the Bluetooth technology, however, is huge and hence not easy for ordinary people to comprehend in a short time. This small book is expected to help interested readers, such as business people, university students, artists, industrial clerks or technicians, even house wives or husbands, etc. to quickly get basic knowledge of the Bluetooth technology and its applications and prospects. The book starts with an overview of the evolutions from the early Internet to the emergency of Bluetooth technology, followed by a review of the Bluetooth core and profile specifications, and a review of some research dealing with issues on scatternets using the technology, and then the perspectives of the technology in the end